干旱区研究

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2021 , Vol. 38 >Issue 2: 487 - 493

DOI: https://doi.org/10.13866/j.azr.2021.02.20

植物与植物生理

水分和养分添加对内蒙古荒漠草原沙生针茅生长与生理特性及其敏感性的影响

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  • 1.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.中国科学院西北生态环境资源研究院,奈曼沙漠化研究站,甘肃 兰州 730000
胡亚（1993-）,女,博士研究生,研究方向为植物生理生态. E-mail:huya@lzb.ac.cn

收稿日期: 2020-06-08

  修回日期: 2020-08-20

  网络出版日期: 2021-04-25

基金资助

国家自然科学基金(41571106);国家自然科学基金(41622103);国家重点研发计划(2016YFC0500506)

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Effects of water and nutrient addition on the growth and physiology of Stipa glareosa in a desert steppe in Inner Mongolia

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  • 1. Urat Desert-grassland Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou 730000, Gansu, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Naiman Desertification Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou 730000 Gansu, China

Received date: 2020-06-08

  Revised date: 2020-08-20

  Online published: 2021-04-25

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摘要

为了探究荒漠草原优势植物对水分和养分输入的响应特征和适应规律,通过设置2个水分水平（自然降雨、水分添加）和3个养分水平（无养分添加、N添加、NPK添加）,共6个处理,研究水分与养分添加对荒漠草原优势植物沙生针茅（Stipa glareosa）生长、生理及其敏感性的影响。双因素方差分析结果表明：水分主效应、养分主效应及水分和养分的交互作用对沙生针茅的生长生理特性具有显著影响（P<0.05）。水分添加显著增加了沙生针茅的叶片鲜重、干重、株高和相对电导率,降低了SOD酶活性;养分添加增加沙生针茅的叶面积,N添加增加了丙二醛含量,NPK添加降低了叶绿素a/b（Ca/Cb）和SOD酶活性;水分和养分的交互作用对叶面积、叶片厚度、叶绿素a（Ca）、脯氨酸、蛋白质含量和SOD酶活性具有显著影响。敏感性分析表明,叶面积和Ca含量对同时添加水分和NPK处理较为敏感,而Ca/Cb对水分添加处理更为敏感。综上所述,沙生针茅可以通过改变特定的生长生理特性适应水分和养分的变化,这对于揭示荒漠草原植物对全球变化的响应机制具有重要意义。

关键词： 养分添加; 水分添加; 氮素; 敏感性; 荒漠草原

本文引用格式

胡亚,郭新新,岳平,李香云,赵生龙,郭爱霞,左小安 . 水分和养分添加对内蒙古荒漠草原沙生针茅生长与生理特性及其敏感性的影响[J]. 干旱区研究, 2021 , 38(2) : 487 -493 . DOI: 10.13866/j.azr.2021.02.20

Abstract

To explore the adaptive responses of dominant species in a desert steppe to environmental changes,we tested the effects of six treatments with two water levels (natural precipitation andartificial irrigation) and three nutrient levels (no nutrient addition, N addition and NPK addition) on the growth and physiology of Stipa glareosain Inner Mongolia. The results of two-wayANOVAshowed that the main factors(water andnutrients) and water × nutrientinteraction had significant effects on some of the growth and physiological parametersof S. glareosa (P<0.05). Water supplementation significantly increased the leaf fresh weight, leaf dry weight, plant height and relative electrical conductivity but decreased superoxide dismutase (SOD) activity. Both N and NPK addition increased leaf area. N addition increased malondialdehyde content, whereasNPK addition decreased chlorophyll a/b and SOD activity. The water × nutrient interaction factor had significant effects on leaf area, leaf thickness, chlorophyll a, proline and protein contents and SOD activity. Moreover, the leaf area and chlorophyll a content of S. glareosawere more sensitive to water and NPK addition, whereas thechlorophyll a/bwas more sensitive to water addition treatments. In conclusion, our results suggest that S. glareosacould adapt to fluctuations in water and nutrient availability by changing specific growth and physiological characteristics, which is important for revealingthe response mechanism of plantsin a desert steppe to climate changes.

Key words： nutrient addition; water addition; nitrogen; sensitivity; desert steppe

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